Which of the following is/are necessary and sufficient condition(s) for pure translation?
The relative position of particles of the body does not change with time.
Velocities of all the particles are parallel to each other at any given instant.
A body always remains parallel to itself throughout its motion.
Velocities of all the points of the body at any instant of time are equal.
Thethree most basic criteria are
a) All the particles of the body have same velocity →v at any instant.
b) Body should be parallel to itself throughout the motion.
c) Velocities of all the particles at any instant are equal.
Also a rigid body (rigid in the given condition throughout its motion) will only satisfy the above mentioned criteria.